| About this Abstract |
| Meeting |
MS&T22: Materials Science & Technology
|
| Symposium
|
Advances in Zinc-coated Sheet Steel Processing and Properties
|
| Presentation Title |
Microstructure Evolution during Early Stages of Liquid Metal Embrittlement in an Advanced High-strength-steel |
| Author(s) |
Yuki Ikeda, Renliang Yuan, Hassan Ghassemi-Armaki, Anirban Chakraborty, Jim Zuo, Robert Maass |
| On-Site Speaker (Planned) |
Robert Maass |
| Abstract Scope |
Despite the high strength and ductility of advanced high-strength steels (AHSS), Zn coatings typically applied to increase the corrosion resistance can be the origin of mechanical property degradation after joining. This property degradation is a manifestation of the well-known Liquid Metal Embrittlement (LME) phenomena, during which liquified Zn infiltrates into the substrate along grain boundaries (GBs). Previously, we have revealed the nucleation and growth of nano-scale intermetallic phases inside uncracked GBs (Materials Today Advances 13, 100196, 2022), which highlights the multi-phase microstructure developing before cracking occurs. To shed further light on the early stages of LME in AHSS, we report here on the microstructural evolution of interrupted welds by using analytical scanning transmission electron microscopy. We discuss these findings in the context of the time-resolved substructure evolution right beneath the interface between the AHSS and the Zn-based coating and track how Zn progressively infiltrates the substrate along phase and GBs. |